Washington earthquakes

M1.9 earthquake 23 km S of Morton, Washington

A magnitude 1.9 earthquake struck 23 km S of Morton, Washington on Mon, Sep 23, 1991, 3:51 AM PDT (10:51 UTC), 9 km (5 mi) below the surface.

A larger quake followed: M3.1 8 km ENE of North Plains, Oregon. This one was a foreshock.

Morton forecastMore in Washington

Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.9 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
1991-09-23 10:51:43 UTC
Depth
8.6 km (5.4 mi), shallow
Epicenter
46.346° N, 122.244° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.2 km horizontally, 0.1 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
55°
Stations used
28

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 45 in the 60 days after this one and 14 in the 30 days before it.

After

  1. 2.538 km NNE of Amboy, Washington · 12792 days ago · -2 km deep · 17 km away
  2. 2.338 km NNE of Amboy, Washington · 12791 days ago · -2 km deep · 17 km away
  3. 2.127 km SSE of Mossyrock, Washington · 12788 days ago · 0 km deep · 8 km away
  4. 1.720 km ENE of Ashford, Washington · 12786 days ago · -1 km deep · 65 km away
  5. 1.938 km NNE of Amboy, Washington · 12783 days ago · -1 km deep · 16 km away
  6. 1.525 km NE of Ashford, Washington · 12783 days ago · -1 km deep · 72 km away
  7. 2.29 km E of Wilkeson, Washington · 12782 days ago · 16 km deep · 87 km away
  8. 1.627 km NE of Ashford, Washington · 12778 days ago · 5 km deep · 73 km away
  9. 1.57 km W of Deer Island, Oregon · 12778 days ago · 23 km deep · 71 km away
  10. 1.624 km NE of Ashford, Washington · 12777 days ago · -1 km deep · 71 km away
  11. 2.122 km ENE of Ashford, Washington · 12776 days ago · -2 km deep · 68 km away
  12. 2.422 km ENE of Ashford, Washington · 12774 days ago · -2 km deep · 67 km away
  13. 1.78 km N of Bethany, Oregon · 12768 days ago · 18 km deep · 93 km away
  14. 3.18 km ENE of North Plains, Oregon · 12768 days ago · 20 km deep · 94 km away
  15. 1.58 km N of Bethany, Oregon · 12768 days ago · 19 km deep · 92 km away
  16. 1.79 km N of Bethany, Oregon · 12768 days ago · 20 km deep · 93 km away
  17. 2.88 km N of Bethany, Oregon · 12768 days ago · 18 km deep · 93 km away
  18. 1.79 km N of Bethany, Oregon · 12766 days ago · 19 km deep · 93 km away
  19. 3.08 km N of Bethany, Oregon · 12765 days ago · 20 km deep · 94 km away
  20. 1.88 km N of Bethany, Oregon · 12764 days ago · 19 km deep · 93 km away
  21. 1.610 km NE of North Plains, Oregon · 12764 days ago · 17 km deep · 92 km away
  22. 2.18 km N of Bethany, Oregon · 12764 days ago · 20 km deep · 93 km away
  23. 2.19 km SE of Bucoda, Washington · 12760 days ago · 21 km deep · 60 km away
  24. 1.924 km ENE of Ashford, Washington · 12760 days ago · -2 km deep · 70 km away
  25. 1.64 km SW of Mill Plain, Washington · 12752 days ago · 18 km deep · 84 km away
  26. 2.54 km WSW of Mill Plain, Washington · 12752 days ago · 15 km deep · 84 km away
  27. 1.84 km S of Orchards, Washington · 12752 days ago · 15 km deep · 84 km away
  28. 1.94 km S of Orchards, Washington · 12752 days ago · 13 km deep · 84 km away
  29. 1.522 km ENE of Ashford, Washington · 12751 days ago · -2 km deep · 66 km away
  30. 1.94 km WSW of Mill Plain, Washington · 12751 days ago · 16 km deep · 84 km away
  31. 1.83 km S of Orchards, Washington · 12750 days ago · 19 km deep · 83 km away
  32. 1.724 km ENE of Ashford, Washington · 12748 days ago · 4 km deep · 68 km away
  33. 1.816 km WSW of La Grande, Washington · 12747 days ago · 17 km deep · 50 km away
  34. 2.69 km SE of Bucoda, Washington · 12746 days ago · 7 km deep · 60 km away
  35. 1.69 km SE of Bucoda, Washington · 12745 days ago · 14 km deep · 60 km away
  36. 1.723 km ENE of Ashford, Washington · 12745 days ago · -2 km deep · 68 km away
  37. 2.79 km SE of Bucoda, Washington · 12745 days ago · 16 km deep · 60 km away
  38. 3.010 km SE of Bucoda, Washington · 12745 days ago · 14 km deep · 59 km away
  39. 1.79 km SE of Bucoda, WA · 12744 days ago · 7 km deep · 60 km away
  40. 1.68 km SE of Bucoda, Washington · 12744 days ago · 21 km deep · 61 km away
  41. 1.62 km WSW of McChord Air Force Base, Washington · 12743 days ago · 50 km deep · 89 km away
  42. 1.719 km ENE of Ashford, Washington · 12739 days ago · -1 km deep · 64 km away
  43. 1.523 km ENE of Ashford, Washington · 12736 days ago · -2 km deep · 69 km away
  44. 1.723 km ENE of Ashford, Washington · 12736 days ago · -2 km deep · 68 km away
  45. 1.623 km ENE of Ashford, Washington · 12735 days ago · -2 km deep · 67 km away

Before

  1. 1.836 km NNE of Amboy, Washington · 12799 days ago · -2 km deep · 18 km away
  2. 2.333 km NE of Amboy, Washington · 12799 days ago · 0 km deep · 24 km away
  3. 1.838 km NNE of Amboy, Washington · 12803 days ago · 3 km deep · 17 km away
  4. 2.138 km NNE of Amboy, Washington · 12804 days ago · 5 km deep · 16 km away
  5. 2.238 km NNE of Amboy, Washington · 12805 days ago · 2 km deep · 16 km away
  6. 2.019 km S of Morton, Washington · 12806 days ago · 16 km deep · 4 km away
  7. 2.837 km NNE of Amboy, Washington · 12806 days ago · 3 km deep · 17 km away
  8. 2.237 km NNE of Amboy, Washington · 12811 days ago · -2 km deep · 18 km away
  9. 2.222 km ENE of Ashford, Washington · 12813 days ago · -2 km deep · 68 km away
  10. 2.038 km NNE of Amboy, Washington · 12818 days ago · -1 km deep · 17 km away
  11. 1.738 km S of Morton, Washington · 12818 days ago · 3 km deep · 15 km away
  12. 2.238 km NNE of Amboy, Washington · 12819 days ago · -2 km deep · 16 km away
  13. 1.73 km SW of Tacoma, Washington · 12819 days ago · 49 km deep · 100 km away
  14. 1.628 km N of Packwood, Washington · 12821 days ago · -1 km deep · 72 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10281533. Read Fri, Oct 2, 2026, 8:10 AM UTC.